"The Power of the Uchiha" (うちはの力, Uchiha no Chikara) is episode 52 of the Naruto: Shippūden anime.

Synopsis

With his skills immensely improved over the years, Sasuke begins to attack Naruto with his sword, but Sai intercepts the attack. Sasuke zaps both of them with his Chidori Current. Sakura decides to charge at Sasuke. Sasuke readies to attack Sakura with his lightning covered sword, but Yamato jumps in front of her, ending up being struck by his attack. As the Nine-Tails attempts to goad Naruto to use its power in his consciousness, Sasuke, using his Sharingan, appears in front of them. The Nine-Tails states that Sasuke's chakra reminds him of Madara Uchiha, before its chakra is totally suppressed by Sasuke.